body {
    text-align: center;
}

.head_img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background-color: #f58220;
    border: solid 2px;
    margin-top: 180px;
    /*居中显示*/
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    font-size: 125px;
    color: #fffef9;
    /*弹性布局flex .father*/
    display: flex;
    justify-content: center;
    /*内容水平居中*/
    align-items: center;
    /*内容垂直居中*/
}
/*.son*/
.xin_img {
    height: 160px;
    width: 160px;
    border-radius: 50%;
    /*margin: 0 auto;*/
}

.btn {
    width: 80%;
    /*居中显示*/
    left: 0;
    right: 0;
    /*position:absolute;*/
    margin-left: auto;
    margin-right: auto;
    margin-top: 50px;
}

.login_btn {
    width: 100%;
    height: 100px;
    background-color: #f58220;
    border-radius: 50px;
    margin-top: 80px;
    border: solid #f58220 2px;

}

.register_btn {
    width: 100%;
    height: 100px;
    background-color: #f58220;
    border-radius: 50px;
    margin-top: 70px;
    border: solid #f58220 2px;
}